code: def test_sphere_to_simplex(self, point, expected, atol):
      res = self.space.metric.sphere_to_simplex(point)
      self.assertAllClose(res, expected, atol=atol)
  
imports: import pytest
  import geomstats.backend
  from geomstats.test.vectorization import generate_vectorization_data
  from geomstats.test_cases.geometry.base import LevelSetTestCase
  from geomstats.test_cases.geometry.riemannian_metric import RiemannianMetricTestCase
  from geomstats.test_cases.information_geometry.base import InformationManifoldMixinTestCase
label_desc: Use image node_id 3 for calling the MultinomialMetricTestCase obj's underlying member method code with example usage: obj.test_sphere_to_simplex(point, expected, atol) without return types